drm/nouveau/ltc: protect clearing of comptags with mutex

Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Cc: stable@vger.kernel.org
2016-12-13 09:29:55 +10:00
parent 64373e4bb6
commit f4e65efc88
1 changed files with 2 additions and 0 deletions
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c
@@ -47,8 +47,10 @@ nvkm_ltc_tags_clear(struct nvkm_ltc *ltc, u32 first, u32 count)

 	BUG_ON((first > limit) || (limit >= ltc->num_tags));

+	mutex_lock(&ltc->subdev.mutex);
 	ltc->func->cbc_clear(ltc, first, limit);
 	ltc->func->cbc_wait(ltc);
+	mutex_unlock(&ltc->subdev.mutex);
 }

 int